Search

Search results

Displaying 71 - 80

gravitation

(Encyclopedia) gravitation, the attractive force existing between any two particles of matter. The term gravitygravity is commonly used synonymously with gravitation, but in correct usage a…

lever

(Encyclopedia) CE5 Classes of levers: A first-class lever (A), a second-class lever (B), and a third-class lever (C) lever, simple machine consisting of a bar supported at some stationary point…

Davis, Benjamin Oliver, Jr.

(Encyclopedia) Davis, Benjamin Oliver, Jr., 1912–2002, American air force general, b. Washington, D.C.; son of Benjamin Oliver Davis. After studying at Western Reserve and Chicago universities, he…

robbery

(Encyclopedia) robbery, in law, felonious taking of property from a person against his will by threatening or committing force or violence. The injury or threat may be directed against the person…

Posse Comitatus Act

(Encyclopedia) Posse Comitatus Act, 1878, U.S. federal law that makes it a crime to use the military as a domestic police force in the United States under most circumstances. The law was designed to…

crusher

(Encyclopedia) crusher, machine used to reduce materials such as ore, coal, stone, and slag to particle sizes that are convenient for their intended uses. Crushers operate by slowly applying a large…

hydraulic machine

(Encyclopedia) CE5 Hydraulic pressure: In any hydraulic device the pressure exerted by one piston is transmitted throughout the fluid. Since pressure equals force divided by area, a small force (…

Holm, Jeanne Marjorie

(Encyclopedia) Holm, Jeanne Marjorie, 1921–2010, U.S. military officer, the first female general in the U.S. air force, b. Portland, Oreg. Enlisting in the Women's Army Auxiliary Corps in 1942, she…

Trenchard, Hugh Montague Trenchard, 1st Viscount

(Encyclopedia) Trenchard, Hugh Montague Trenchard, 1st Viscount, 1873–1956, British air marshal. He entered the army in 1893 and served in the South African War. During World War I he commanded the…